Power-transmission device.



L. C. HAMEL.

POWER TRANSMISSION DEVICE.` APPLICATION FILED MAR. IS, I9I4.

LMAQ. PaIenIedJu1y13,I915.

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FOWER TRANSMISSION DEVICE.

APPLICATION FILED MAR. I8. 1914.

LMSAQ., Pand my 13, 1915.

2 SHEETS-SHEET 2.

'ra sra'ras Parana oracion.

LOUIS C. HAMEL, OF APPLETON, WISCONSIN.

PoWEBfTRANsi/rrssron DEVICE.

Specification of Letters Patent.

` Patented July is, i915.

I Application filed March 18, 1914. Serial N0. 825,662.

ing is a specification.

This invention relates to driving gears in which a resilient drivingconnection is 1nlterposed between the drivingand the driven members, forthe purpose of absorbing shocks or jerks from the sudden application ofpower to the d-riving member. j

The invention has for its object to provide a simple and efficientdevice of the kind stated, and to this end it consists in a novelcombination and arrangement o f parts to be hereinafter described andclaimed, reference being had to the accompanying drawing in which-Figure 1 is a longitudinal section show-i ing one form of the device;Fig. 2 is an end View thereof; Fig. 3 is a longitudinal section showinganother embodiment of the invention; Fig. 4 is a similar view showingstill another modification, and Fig. 5 is a section on the line 5 5 ofFig. 4.

In carrying out the present invention, there is provided a drivingmember and a driven member having a resilient driving connection. Asshown in Figs. 1 and l2, one of the members is a shaft 10 carrying theother member, which latter may be a sprocket wheelfpulley, gear orsimilar member 11 having on one side an4 elongated hub extension 12,.theinternal diameter of which is greater than the diameter of theshaft. The other side of the member 11 abuts against a shoulder 13 onthe-shaft 10. The hub extension 12 forms a housing forv a coiled spring14 which is the resilienty driving connection between the members 10 and11, said spring surrounding the shaft and be.- ing made fast at one endto the inner end of the housing, as indicated at 15.. The outer end ofthe housing is closed. by a disk 16 which' serves as a means foranchoring the other .end Aof the spring. The disk is pinned to theshaft,v l0 as indicated at 17. The outer end of the shaft has a reduced,threaded portion 18 passing through the disk and projecting therefrom,on ,which 'projecting end, and against the outer face of the disk, isscrewed a nut 19, whereby the disk is. rigidly fastened on the shaft. Onthe inner face of the disk are apertures 20, into a selected one ofwhich the outer end of the spring is adapted to be seated. A series ofapertures is provided in order that the tension of the spring may beadjusted. The disk 16 seats in the outer end of the housing 12 and has asegmental lug 21 on its outer face. The outer end of the housing is cutaway to form -a recess to accommodate the lug, the remaining end portionof the housing forming an arcuate stop abutment 22 between the ends ofwhich the lug is located. The spring 14 provides aresilient drivingconnectionbe- Ytween the shaft 10 and the member 11 and absorbs allshocks and jerks, the relative movement of the parts being limited bythe lug 21 and the abutment 22. Longitudinal movement of the member 11on the shaft is prevented by the shoulder 13 and the disk 16.

Fig. 3 shows a slightly modified structure in which the shaft 10 isdevoid of a shoulder, but carries a set collar 23 on one side of themember 11 and the disk 16 is secured to the shaft by a set screw 24. j

Fig. 4 shows two gear wheels, sprocket wheels, pulleys orl other members25 and 26, respectively, .mounted on a stationary shaft 27 between setcollars 28. Each member has an elongated hub extension on one side, thehub extension of the member 25 being indicated at 29 and that of themember 26 at 30. The hub extensions project toward and overlap eachother, the extension 30 being on the inside and serving as a housing fora spring 31 coiled around the shaft 27 and connected at one end to themember 25 and at the other 'y motion lof one being transmitted by thespring to the other, thereby taking up all l shocks and jerks.

On the inner face of the member 26 is a lug 32 which is located betweentwo stop shoulders 33 formed by cutting a recess in the end of the hubextension 29. These parts limit the relative movement ofthe members 25and 26 in the same manner as the lug 21 and the abutment 22 hereinbeforedescribed. The lug 32 is normally in contact with one of the shoulders33, and whenV power s applied to one of the members, the lug movesagainst the tension of the spring toward the 'a driving and a drivenmemberl loosely mounted on said shaft, and spaced laterally, theopposite sides of said members having elongated hub extensions fittingloosely one within the other, and a spring coiled around the shaft, andconnected at its ends to the driving and -the driven membersrespectively, the internal diameter of the inner hub extension beinggreaterhthan the diameter of the shaft, to accommodate the spring, themember which has said inner hub extension being provided with a lug,said lug being opposite the end of the hub extension of the othermember, said last-mentioned hub extension having an end recess the endsof which form stop shoulders between which the aforesaid lug is located.

' 2. The combination with a driving and a driven member, one of saidmembers having a hub extension on one side through which the othermember passes, the outer end of said hub extension having a recess, andthe second-mentioned member having a portion opposite the recessed endof the hub extension and carrying a lug which extends into the recess,means for holding the members against endwise separation, and aresilient driving connection between the members, said connection beinglocated in the hub extension. 1

3. The combination with a driving and a driven member, one of saidmembers having a hub extension on one side through which the othermember passes, the outer end of said hub extension having a recess, andthe second-mentioned member having a portion opposite the recessed endof the hub extension and carrying a lug which extends into the recess,said portion also having a series of apertures'on its inner face, and aspring inclosed in the -hub extension and secured at one end to one ofthe members and at its other end in one of the aforesaid apertures.

In testimony whereof I aiix mysignature in presence of two witnesses.

LOUIS C. HAMEL. -Witnesses:

P. T. HAQHBERT, B. J.. ZsUPsKI.

